Ubu ni bwo buryo bwo hejuru bwo guca kumurongo muremure, bugenewe cyane cyane ibishishwa bya aluminiyumu, kuguruka kubona ibiti birakenewe kuri uyu murongo
Ibiceri bya aluminiyumu bikenera imashini iboneza, kugirango isezeranye ukuri. Ibi byakozwe muburyo bwa aluminiyumu , kuko byoroshye cyane.